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CVE-2020-26250

21
FAUCET Score

CVE-2020-26250 affects OAuthenticator versions 0.12.0 and 0.12.1 when used with JupyterHub 1.2, where a deprecated configuration for user whitelisting is ignored, potentially allowing any authenticated user access to JupyterHub. This vulnerability carries a CVSS score of 6.3 (Medium) with a network attack vector and high confidentiality impact, but requires low privileges and high attack complexity. There is no evidence of active exploitation, publicly available exploit code, or significant community discussion surrounding this vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
>= 0.12.0, < 0.12.2CPE matchmatch criteria
cpe:2.3:a:jupyter:oauthenticator:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

6.3MEDIUM

CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N

Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
LOW
User Interaction
NONE
Scope
CHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
Exploitability Score
1.8
Impact Score
4.0
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.12%
Probability of exploitation in next 30 days
EPSS Percentile
62.7%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0112 is in the 59th percentile among its peer group of 1,428 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

github_advisorypatch availablevia nvd_reference
View patch
pippatch availablevia ghsa
Product: oauthenticatorFixed in: 0.12.2

Vendor Advisories (1)

pipGHSA-384w-5v3f-q499high

Base class whitelist configuration ignored in OAuthenticator

Dec 1, 2020

References

github.com / jupyterhub/oauthenticator/blob/master/docs/source/changelog.md
Release NotesThird Party Advisory
github.com / jupyterhub/oauthenticator/commit/a4aac191c16cf6281f3d346615aefa75702b02d7
PatchThird Party Advisory
github.com / jupyterhub/oauthenticator/security/advisories/GHSA-384w-5v3f-q499
Third Party Advisory
jupyterhub.readthedocs.io / en/1.2.2/getting-started/authenticators-users-basics.html
Third Party Advisory